Results 21 to 30 of about 181,882 (261)
The Ultra Low Frequency Force Ballistocardiograph in Acute Cardiomyopathy [PDF]
Circulation, 1967 In this study, ultra low frequency force ballistocardiograms were recorded throughout the course of various types of acute cardiomyopathy. Conditions studied included rheumatic carditis, lupus myocarditis, sarcoid carditis, viral myocarditis, acute glomerulonephritis, idiopathic myocarditis, and familial fibrous disease of the myocardium.
B, Phibbs, C R, Lowe, R W, Holmes
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Characterization of ultra low frequency (ULF) pulsations and the investigation of their possible source [PDF]
Annales Geophysicae, 2009 In this paper we present the results from the observation of ultra low frequency (ULF) pulsations in the Doppler velocity data from SuperDARN HF radar located at Goose Bay (61.94° N, 23.02° E, geomagnetic).
S. H. Mthembu +4 more
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Measurement Science Review, 2017 The investigation presented in the paper was performed in the laboratories of the Department of Theoretical and Experimental Electrical Engineering, Faculty of Electrical Engineering and Communication, Brno University of Technology, between April 22 and ...
Hanzelka M. +5 more
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Low-frequency GMRT observations of ultra-cool dwarfs [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 Observations of radio emission in about 10 per cent of ultra-cool dwarfs (UCDs) indicate the presence of strong, persistent magnetic fields in these stars. These results are in contrast to early theoretical expectations on fully-convective dynamos, and to other tracers of magnetic activity, such as H α and X-ray luminosity. Radio-frequency observations
Zic, Andrew +4 more
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Clamped seismic metamaterials: ultra-low frequency stop bands
New Journal of Physics, 2017 The regularity of earthquakes, their destructive power, and the nuisance of ground vibration in urban environments, all motivate designs of defence structures to lessen the impact of seismic and ground vibration waves on buildings.
Y Achaoui +5 more
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Ultra Wideband, Low Frequency, and Low Profile Combined Metamaterial-Ferrite Absorber
IEEE AccessThis paper presents a novel absorber topology that combines an absorbing metamaterial with a ferrite tile, resulting in an ultra-wideband absorber with a bandwidth of 196%, covering the frequency range of 10 MHz to 3500 MHz (1:350). The proposed absorber
Amir Sahraei +3 more
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Influence of stress wave-induced disturbance on ultra-low friction in broken blocks
International Journal of Coal Science & Technology, 2022 Deep rock mass tends to be broken into blocks when mining for materials deep below the surface. The rock layer of the roof of the mine can be regarded as a system of blocks of fractured rock mass.
Liping Li +5 more
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Annals of Geophysics, 2001 Different methods with different results have been proposed in the scientific literature to identify the possible occurrence of weak seismo-magnetic ULF emissions. In September-October, 1997 Central Italy was struck by repeated seismic activity (M L <
A. Piancatelli, M. Vellante, U. Villante
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Applied Sciences, 2022 This paper proposes an I-shaped radial elastic metamaterial with ultra-low-frequency broadband characteristics and studies the propagation characteristics of elastic waves in their quasi-static state.
Haixia Liu, Weitao He, Lixia Li, Qi Jia
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Thick conducting polymer films for ultra-low frequency stimulation [PDF]
APL Electronic DevicesConducting polymers like poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) offer the possibility of improving the electrochemical performance of bioelectronic and biomedical devices beyond what conventional electrode materials offer. To
Christopher M. Proctor +1 more
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